Set $wgResourceBasePath

This line is usually generated automatically by the installer,
but only since 1.27.

This fixes things like $wgLogo in versions <1.27.

Author: edg2s

localsettings/core.php

@@ -11,6 +11,9 @@
 $wgShowExceptionDetails = true;
 $wgDebugComments = true;
 
+// Usually generated by the installer, but only since 1.27
+$wgResourceBasePath = $wgScriptPath;
+
 // Slice off the '/w' from the end
 $basePath = substr( $wgScriptPath, 0, -2 );